A pressure gauge is located in the suction side of a water pump. It shows 25 inches of Hg. Lot of bubbles are present in the pipe. Does it mean that there is presence of cavitation in the pipe due to negative pressure? What is the relation between vapor pressure of water and negative pressure?
For eg., 9500 Pa is vapor pressure of water at 45 deg C.
If pressure is negative 25 inch Hg at 45 deg C, what does that mean?
How to identify presence of cavitation with a pressure gauge located in the suction side of pump?
Thanks Dr Mamdouh.
I have a restriction (inside the pipe) in the suction side of my pump to purposely generate cavitation. My pressure gauge located 200 mm far from the restriction shows 88000 Pa. Can i use the readings from the flow meter located in the discharge side of my pump to calculate the pump suction velocity. If i can do that, i can use cavitation number to represent cavitation in the flow.
Nagalingam,
I was about to offer an idea but just read that you designed this with a restriction to enhance cavitation. Instead of asking us to guess...Please explain the design so we can offer appropriate help.
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